Carrier 38HDR018-060 Rig and Mount Unit, Lifting Unit with Sling, AccuRater Bypass Type Metering

Step 2 — Rig and Mount Unit

MOUNTING ON GROUND — Mount unit on a solid, level concrete pad. Position unit so water or ice from roof does not fall directly onto unit. Accessory stacking kits can be used when units are to be stacked. See installation instructions provided with the accessory kit. Use field-provided snow stand or ice rack where prolonged subfreezing temperatures or heavy snow occurs.

If conditions or local codes require unit be fastened to a pad, 6 field-supplied tiedown bolts should be used and fastened through slots provided in unit mounting feet.

MOUNTING ON ROOF — Mount unit on a level platform or frame at least 6 in. above roof surface. Isolate unit and tub- ing from structure.

RIGGING

Be sure unit panels are securely in place prior to rigging. Loose unit panels could result in equipment damage or per- sonal injury.

Keep the unit upright and lift unit using a sling. Use card- board or padding under the sling, and spreader bars to prevent sling damage to the unit. See Fig. 3. See Fig. 2 for center of gravity reference. Install the unit so that the coil does not face into prevailing winds. If this is not possible and constant winds above 25 mph are expected, use accessory wind baffle. See installation instructions provided with the accessory kit.

NOTE: Accessory wind baffles should be used on all units with accessory low ambient temperature control.

Field-fabricated snow or ice stands may be used to raise unit when operation will be required during winter months. Units may also be wall mounted using the accessory wall-mounting kit.

Fig. 3 — Lifting Unit with Sling

Step 3 — Complete Refrigerant Piping Con- nections — Outdoor units may be connected to indoor units using field-supplied tubing of refrigerant grade and condi- tion. See Tables 1A and 1B for correct line sizes. Do not use less than 10 ft of interconnecting tubing.

DO NOT BURY MORE THAN 36 IN. OF REFRIGER- ANT PIPE IN THE GROUND. If any section of pipe is buried, there must be a 6-in. vertical rise to the valve connections on the outdoor unit. If more than the recommended length is buried refrigerant may migrate to cooler, buried section during extended periods of system shutdown. This causes refrigerant slugging and could possibly damage the compressor at start-up.

When more than 50 ft of interconnecting tubing and more than 30 ft of vertical lift is used, consult the residential long line application instruction guide. For long-line applications, inter- connecting lines over 100 ft must be installed with a liquid line solenoid. A liquid line solenoid may also be installed on some units to improve part-load efficiency. Refer to the ARI (Air Conditioning & Refrigeration Institute) Directory.

If either refrigerant tubing or indoor coil is exposed to the atmosphere, the system must be evacuated following good refrigeration practices.

Run refrigerant tubes as directly as possible, avoiding unnecessary turns and bends. Suspend refrigerant tubes so they do not damage insulation on vapor tube and do not transmit vibration to structure. Also, when passing refrigerant tubes through a wall, seal the opening so that vibration is not transmit- ted to structure. Leave some slack in refrigerant tubes between structure and outdoor unit to absorb vibration. Refer to separate indoor unit installation instructions for additional information.

CHECK ACCURATER CONTROL — The correct Accu- Rater (bypass type) refrigerant control is required for system capacity optimization. An AccuRater device with field- replaceable piston (see Fig. 4) is supplied with the outdoor unit. Refer to the AccuRater metering device table in separate indoor unit installation instructions to determine the correct AccuRater piston size required for the condenser/evaporator system being installed.

Piston style as shown in Fig. 4 is shipped with the unit. Do not interchange components between the AccuRater device types. Matching of outdoor unit with indoor unit may require field replacement of piston. Replace piston, if required, before connecting refrigerant lines. See Fig. 4. Piston replacement instructions are included in the indoor unit installation instruc- tions. After system installation is complete, see the Refrigerant Charging section on page 12 to check and/or adjust refrigerant charge.

FILTER DRIER — The filter drier must be replaced whenev- er the refrigeration system is exposed to the atmosphere. See Fig. 4 for filter drier installation.

NOTE: Arrow on AccuRater body points in free flow direction, away from the indoor coil.

38HDF018-036

38HDR018-060

Fig. 4 — AccuRater (Bypass Type) Metering

Device Components

3